To function correctly in the nervous system, a neuron must produce an appropriate neurotransmitter. Little is known about the mechanisms that govern this choice within developing neurons. Since the same neurotransmitters are used by organisms throughout the animal kingdom, genes regulating neurotransmitter choice are likely to be conserved among simple and complex organisms. Therefore, it is proposed to study this problem in a simple organism which is readily amenable to genetic and molecular analysis, the nematode worm Caenorhabditis elegans. This study will examine the regulation of neurotransmitter-specific genes expressed in serotonergic neurons ('serotonergic marker genes') of C. elegans. C. elegans genes necessary for serotonin synthesis and packaging: tryptophan hydroxylase, dopa decarboxylase, and vesicular monoamine transporter have been identified. It is proposed to 1) identify regulatory elements by comparing promoters of the homologous marker genes from a closely-related species and performing promoter deletion analyses, 2) identify regulatory genes by screening for mutants that do not express or mis-express the serotonergic marker genes. The long term goal of these studies is to understand how genes control the expression of specific neuronal identities, in particular, the neurotransmitter type of a neuron. Such studies may allow us to understand better why neurological disorders target specific subsets of neurons and ultimately to develop therapies to control the expression of neurotransmitters in specific cells of the human nervous system.
Loer, Curtis M; Calvo, Ana C; Watschinger, Katrin et al. (2015) Cuticle integrity and biogenic amine synthesis in Caenorhabditis elegans require the cofactor tetrahydrobiopterin (BH4). Genetics 200:237-53 |
Rivard, Laura; Srinivasan, Jagan; Stone, Allison et al. (2010) A comparison of experience-dependent locomotory behaviors and biogenic amine neurons in nematode relatives of Caenorhabditis elegans. BMC Neurosci 11:22 |
Loer, Curtis M; Rivard, Laura (2007) Evolution of neuronal patterning in free-living rhabditid nematodes I: Sex-specific serotonin-containing neurons. J Comp Neurol 502:736-67 |
Hare, Emily E; Loer, Curtis M (2004) Function and evolution of the serotonin-synthetic bas-1 gene and other aromatic amino acid decarboxylase genes in Caenorhabditis. BMC Evol Biol 4:24 |